I have had power loss and backfiring in my car the last month, and having taken it to a garage they have replaced the plugs( which obviously were not changed at the last Merc service) and it was obvious one had been tracking for quite a while. While it has improved the performance, it is still not quite right. Less backfiring , but still there, especially at low revs when trying to accelerate, and a definate loss of power when trying to accelerate from low revs. High speed travelling seems to be fine, once on the moterway all if great. So Could the tracking have damaged the coil?, and if so is it easy to replace one.
toad